When is the shortest dark month in a year?

1, in the southern hemisphere, the shortest month at night is 65438+February.

2. In the northern hemisphere, the month with the shortest night is June.

Take Beijing in the northern hemisphere as an example for the following reasons:

There are only 28 days in February (29 days in leap year), which is 2 days less than June (leap year 1 day) where the summer solstice is located. Because the time difference between winter solstice and summer solstice is five and a half hours, it can be inferred that the night in June is 2.5 hours shorter than that in February.

According to the difference of two days between February and June, the difference between 28 nights in February and 28 nights in June is 70 hours, the night in February is 70 hours longer than the 28 days, and the extra two days in June are about 23 hours (the end of June is close to the summer solstice), so the night in June is about 47 hours shorter than that in February. So June is the shortest month.

The night is the longest in the northern hemisphere and the shortest in the southern hemisphere. Therefore, the shortest night in the southern hemisphere is 65438+February (the summer solstice in the southern hemisphere is on the winter solstice in the northern hemisphere).

Extended data:

During the year, from the solstice in summer to the solstice in winter, the nights gradually get longer and reach the longest in the solstice in winter. From the solstice in winter to the solstice in summer, the night becomes shorter and shorter, and reaches the shortest in summer.

In the equatorial region, the day length of the summer solstice is 12 hours, and the day length of the winter solstice is 12 hours, with a difference of 0 hours.

At latitude 20, the summer solstice is 13 hours 13 minutes, and the winter solstice is 10 hour 47 minutes, with a difference of 2 hours and 26 minutes.

The latitude is 40 degrees north and south, the summer solstice is 14 hours 5 1 minute, and the winter solstice is 9 hours 09 minutes, with a difference of 5 hours 42 minutes.

The latitude is 60 degrees north and south, the summer solstice is 18 hours and 29 minutes, and the winter solstice is 5 hours and 3 1 minute, with a difference of 12 hours and 58 minutes.